Ruthless, invulnerable, that Scarred Hand reached out to destroy the entire law machine of New York — blasting into merciless oblivion those juries which dared convict even a single criminal. In that twilight of terror, when empty cells yawned for the felons who never arrived, and helpless Justice hid her bloodied head — no one but Richard Wentworth could combat this invisible Juggernaut which had paralyzed five mighty boroughs. Once more, in the Spider’s weird vestments, Wentworth sets out — this time to annihilate a brain so evil that it is encased in two heads! Slaves of the Black Monarch is torn from the pages of the August, 1937 issue of The Spider magazine.